<style>div { position:absolute; width:200px; height:200px; }</style>
<div style="background: radial-gradient(100px 100px at 60px 80px, white, black); top:10px; left:10px;"></div>
<div style="background: radial-gradient(100px at 140px 80px, white, black); top:10px; left:220px;"></div>
<div style="background: radial-gradient(100px 100px at 80px 60px, white, black); top:220px; left:10px;"></div>
<div style="background: radial-gradient(100px at 80px 140px, white, black); top:220px; left:220px;"></div>
<div style="background: radial-gradient(84.8528137px 113.137084px at 60px 80px, white, black 60px); top:430px; left:10px;"></div>
<div style="background: radial-gradient(84.8528137px 113.137084px at 140px 80px, white, black 60px); top:430px; left:220px;"></div>
<div style="background: radial-gradient(113.137084px 84.8528137px at 80px 60px, white, black 80px); top:640px; left:10px;"></div>
<div style="background: radial-gradient(113.137084px 84.8528137px at 80px 140px, white, black 80px); top:640px; left:220px;"></div>
